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Date: Mon, 10 Feb 2020 19:50:04 -0800 From: Minchan Kim <minchan@...nel.org> To: Matthew Wilcox <willy@...radead.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm <linux-mm@...ck.org>, Josef Bacik <josef@...icpanda.com>, Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] mm: fix long time stall from mm_populate On Mon, Feb 10, 2020 at 05:10:21PM -0800, Matthew Wilcox wrote: > On Mon, Feb 10, 2020 at 04:19:58PM -0800, Minchan Kim wrote: > > filemap_fault > > find a page form page(PG_uptodate|PG_readahead|PG_writeback) > > Uh ... That shouldn't be possible. Please see shrink_page_list. Vmscan uses PG_reclaim to accelerate page reclaim when the writeback is done so the page will have both flags at the same time and the PG reclaim could be regarded as PG_readahead in fault conext. > > /* > * Same bit is used for PG_readahead and PG_reclaim. > */ > if (PageWriteback(page)) > return; > > ClearPageReadahead(page); >
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